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Caudal agenesis. T2 weighted sagittal (A), T1 weighted sagittal (B) and T2 weighted coronal (C) MR images showing type II caudal agenesis. There is non-development of distal sacral vertebra (white arrow in A) with abnormal termination of conus medullaris (black arrow). The child also has associated left hydronephrosis (dashed arrow in C).
